Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

DNS and logonserver

Posted on 2006-06-24
8
Medium Priority
?
1,850 Views
Last Modified: 2008-10-09
I am trying to learn more about DNS and the _msdcs and things below it.  I just learned that these are records that are queried by other machines to find out where a service is located at.   What I am working on now is trying to figure out what makes a client choose one logon server or another.   I have a DC1 and DC2 which are both global catalog AD servers Then I have a Monitor machine which is AD server only.  the DC1 contains the DNS.   When my exchange server or even my machine logs on its logon server ends up being the monitor machine.   What causes that and how do I get it to logon to DC1?

thanks in advance for any help offered.
0
Comment
Question by:techbnjcomp
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
8 Comments
 
LVL 48

Expert Comment

by:Jay_Jay70
ID: 16977472
windows looks after itself using KCC and other technologies - a kind of auto load balancing, with windows 2000+ the only way you can force a logon to a certain server that i am aware of, is to have sites setup in AD sites and Services and assign subnets to them, otherwise,  if you are in a single site, there is no need to do anything
0
 
LVL 1

Author Comment

by:techbnjcomp
ID: 16977785
I have two sites and actually a few more servers that I did not mention as they are in another site.    I see a priority and weight in the kerberous dns records and wondered if that was causing some kind of election.    
0
 
LVL 48

Expert Comment

by:Jay_Jay70
ID: 16977874
have you configured your sites in AD?
0
U.S. Department of Agriculture and Acronis Access

With the new era of mobile computing, smartphones and tablets, wireless communications and cloud services, the USDA sought to take advantage of a mobilized workforce and the blurring lines between personal and corporate computing resources.

 
LVL 8

Expert Comment

by:bilbus
ID: 16977878
you can use a login script to tell you what server its connecting to
0
 
LVL 1

Author Comment

by:techbnjcomp
ID: 16978260
Guys thanks for your help but I am not being articulate enough here.   I do know what server they are using as logonserver (cmd line   set logonserver tells me).  I am trying to tell how the dns records determine whether it uses dc1, dc2, or monitor.   Is it priority or what is causing it to use monitor instead of dc1 ?
0
 
LVL 13

Assisted Solution

by:itcoza
itcoza earned 600 total points
ID: 16979687
Hi techbnjcomp,

I think I understand what you are after.  Have a look at this MS KB:  http://support.microsoft.com/default.aspx?scid=kb;en-us;831201
It is apparent that the servers are given their priority for service in the DNS SVC records.  The article also describes the steps you need to take if you want to change this.

Regards,
M
0
 
LVL 51

Expert Comment

by:Netman66
ID: 16980060
Normally, it uses DNS Round Robin to find a server in the same site.  If Round Robin is not checked in DNS then it will use the first server it finds that answers it.

You can use DNS weighting, but it's not recommended because everyone will use that DC rather than spread out the load.

0
 
LVL 22

Accepted Solution

by:
Paka earned 1400 total points
ID: 17114081
There probably two mechanisms running here.  One is the logonserver environmental variable and the other is the DNS query for domain controllers.  If memory serves, the client will use the last setting for logonserver instead of querying for a DNS server if it is set.  If that fails, the logon service will query DNS for an authenticating domain controller.

Try setting the logon server to DC1 using "set logonserver=DC1" at the command prompt and the netlogon service should attempt to authenticate with DC1 then next time it starts.
0

Featured Post

Hire Technology Freelancers with Gigs

Work with freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely, and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

by Batuhan Cetin Within the dynamic life of an IT administrator, we hold many information in our minds like user names, passwords, IDs, phone numbers, incomes, service tags, bills and the order from our wives to buy milk when coming back to home.…
Learn about cloud computing and its benefits for small business owners.
This course is ideal for IT System Administrators working with VMware vSphere and its associated products in their company infrastructure. This course teaches you how to install and maintain this virtualization technology to store data, prevent vuln…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.

670 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question